方法对比

//修改前
namespace CleanCSharp.Methods.Dirty
{
    class Utils
    {
        public int Process(Customer customer)
        {
            if (string.IsNullOrWhiteSpace(customer.FirstName)
                || string.IsNullOrWhiteSpace(customer.LastName))
            {
                return -1;
            }
            else
            {
                var service = new CustomerService();
            }
      
            if (!service.Save(customer))
            {
                return -1;
            }
            else
            {
                return 1;
            }
        }
    }
            
}

//修改后
namespace CleanCSharp.Methods.Clean
{
    class Utils
    {
        public int Process(Customer customer)
        {
            const int customerNotSaved = -1;
            const int customerSavedSuccessfully = 1;
            if (!IsValidCustomer(customer))
            {
                return customerNotSaved;
            }
            if (!SaveCustomer(customer))
            {
            return customerNotSaved;
            }
            return customerSavedSuccessfully;
        }
        private bool IsValidCustomer(Customer customer)
        {
            if (string.IsNullOrWhiteSpace(customer.FirstName)
                || string.IsNullOrWhiteSpace(customer.LastName))
            {
                return false;
            }
            return true;
        }
        private bool SaveCustomer(Customer customer)
        {

            var service = new CustomerService();
            var successfullySaved = service.Save(customer);
            return successfullySaved;
        }
    }
}